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Verb: illegalise  i'lee-gu,lIz
Usage: Brit (N. Amer: illegalize)
  1. Declare illegal; ban
    "Marijuana is illegalised in the U.S.";
    - outlaw, criminalize, criminalise [Brit], illegalize

Derived forms: illegalises, illegalising, illegalised

Type of: disallow, forbid, interdict, nix [N. Amer, informal], prohibit, proscribe, veto

Antonym: decriminalise [Brit]